The playbook — copper · October 28, 2026
High-grade copper hits at El Roble as reserves run toward 2027
Atico drills 18.6m of 7.65% copper underground, feeding a reserve update due early next year — but the market hasn't moved.
Atico Mining drilled a batch of underground holes at its El Roble copper-gold mine in Colombia and posted some genuinely rich numbers. The flagship hole cut 18.6 metres grading 7.65% copper plus 2.22 grams of gold per tonne — meaning nearly eight percent of that rock, by weight, is copper metal. Other holes were shorter but hotter: 9.0 metres at 8.44% copper with 3.58 g/t gold, 5.7 metres at 8.48% copper with a thick 7.41 g/t gold credit, and one 4.5-metre slice running 16.13% copper. These are massive-sulphide grades — among the richest base-metal intercepts drilled anywhere. The whole program was 32 holes for just 1,689 metres, so these are short, shallow holes inside and just outside a body the company already mines.
The reason this matters is a calendar problem. Atico’s March 2024 reserve estimate only supports mining through the first quarter of 2027. This drilling is infill — it fills gaps in a known orebody and nudges the edges — and it feeds directly into an updated reserve statement the company says is coming early next year. So the real question isn’t grade, which is excellent; it’s tonnage, which nobody can score until that reserve update lands. Atico is an actual producer, not a story stock: Ganoza’s team lifted El Roble’s throughput from 400 to 1,000 tonnes a day. That operating record is the backdrop. And yet the market shrugged — the stock sat flat at C$0.22 over three months while copper itself gained 5.2% and copper-equity peers barely moved. No catalyst caught the commodity tailwind.
What to watch is the reserve update the company targets for early 2027, and continued underground drilling that the company says will continue through 2026 and 2027. Now the honest part. True widths are disclosed as a blanket 90% to 95% of core length — a real estimate, but not hole-by-hole geometric modelling. The release says the deposit stays open at depth and along strike, but it gives no collar coordinates, no azimuths, no dips and no step-out distances, so how far these holes actually extend the body can’t be verified from the text. And the tonnage impact of all this high grade stays unquantified until the reserve statement arrives.